Move over Hadid sisters, you’re no longer the only ones with upfront assets to flash.

As evidenced by recent splashy, sexy looks sported by Harry Styles, a number of preening professional athletes and models at recent fashion shows, male cleavage is busting out on the studliest stars. Shirts unbuttoned to the sternum and undone jackets allow well-built men to show off nicely sculpted chest muscles.

And women in the rag trade are not complaining. “I am absolutely into it,” gushes stylist Calyann Barnett, who dresses elite athletes such as Usain Bolt, Rajon Rondo and Victor Oladipo. “When you decide to keep the buttons low or wear a sweater that goes to your belly button, you show a level of confidence — and that is very sexy.”

A case in point is her client Dwyane Wade, in the stands, “At the NBA finals this year, he wore a track jacket that was zipped down. I loved it, he loved it and 50 percent of the world loved it. He’s confident enough that he didn’t care about the other 50 percent.”

‘A man with a big, muscular chest is like a woman with large breasts.’

- Christiaan Choy, stylist

This past June, Paris runways sizzled with hot models exposing smooth pectorals for designers such as Dior Homme and Études, which both showcased dudes sans shirts under suiting.

As plunging necklines make the leap from runway to real life, stylist Allison St. Germain says that for some it should come with a warning: “I like the look with buttoned-down shirts, tucked-in, linen or cotton. But definitely not polyester.”

Speaking of polyester, Barnett sees the trend as a byproduct of renewed interest in the 1970s.
“People showed off their bodies back then,” Barnett says. “Maybe it got so hot in the discos that guys had to unbutton.”

Stylist Christiaan Choy credits the look to guys’ increased interest in both developing a unique personal style and staying fit.

Harry StylesGetty Images

“Men are keeping themselves in good shape and they are becoming comfortable about experimenting with fashion,” says Choy, creative director of the new menswear company Benjamin Custom Suits, who has styled Victor Cruz, Lamar Odom and Amar’e Stoudemire.

“People want to work out and show off their bodies — and this is one way to do it.”

Sometimes, though, the look can come across as more “Jersey Shore” than urban sophisticate.
“A man with a big, muscular chest is like a woman with large breasts,” Choy says.

“It’s tasteful for a woman to wear something low cut when she has smaller breasts. Same thing for guys.” Regardless of gender, “cleavage when it’s overshown is not tasteful.”

Bad as being too built might be, Barnett warns that there are some physiques for which cleavage baring is way less appropriate.

“I know that dad bods were a big deal for a while,” she says. “But I don’t want to see dad bods and male cleavage. Those two trends should never cross paths.”